Method for eliminating error of Shack Hartmann wavefront sensor model

A wavefront sensor, model error technology, applied in instruments, scientific instruments, measuring devices, etc., can solve problems such as model errors

Inactive Publication Date: 2006-06-28
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods are powerless to the model error introduced by the Shack-Hartmann wavefront sensor due to discrete sampling in principle

Method used

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  • Method for eliminating error of Shack Hartmann wavefront sensor model
  • Method for eliminating error of Shack Hartmann wavefront sensor model
  • Method for eliminating error of Shack Hartmann wavefront sensor model

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Embodiment Construction

[0017] The steps of the specific embodiment of the present invention are as follows:

[0018] (1) According to the type and layout of the beam splitting element used by the Shack-Hartmann wavefront sensor, the calculation process is as follows:

[0019] (a) Definition of model error: In principle, Φ(x, y) is measured by the Shack-Hartmann wavefront sensor as Φ′(x, y), and the difference between the two is δ(x, y), namely is the model error; its essence includes two parts: discrete sampling error and reconstruction error.

[0020] (b), arbitrary wavefront Φ(x, y) can be expanded using orthogonal Zernike polynomials as basis functions:

[0021] Φ = ( x , y ) = Σ k = 1 l a k · z k ( ...

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Abstract

A method for eliminating model error of Shack ¿C Hartman wave ¿C front transducer includes calculating error revision matrix according to type and layout of light beam dividing element used by Shack ¿C Hartman wave ¿C front transducer, calculating inverse matrix of error revision matrix, acting error revision inverse matrix on actual measured result of Shack ¿C Hartman wave ¿C front transducer for eliminating model error.

Description

technical field [0001] The invention relates to a method for eliminating model errors of Shack-Hartmann wavefront sensors. Background technique [0002] Currently widely used wavefront sensors include shearing interferometers and Shack-Hartmann wavefront sensors. Shearing interferometers were widely used in early adaptive optics. In 1974, J.W.Hardy et al. first used transverse shearing interferometers to measure the wavefront phase distortion affected by atmospheric turbulence; in the later period, Shack-Hartmann wave Front sensors are gradually becoming the most commonly used wavefront sensors in adaptive optics systems. For example, the SWAT wavefront sensor established by Lincoln Laboratory in the United States in the late 1980s. [0003] The reason why the Shack-Hartmann wavefront sensor is widely used is that the Shack-Hartmann wavefront sensor has many advantages that the shearing interferometer does not have. The shearing interferometer has low light energy utiliza...

Claims

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Application Information

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IPC IPC(8): G01J9/00
Inventor 李恩德胡诗杰戴云张雨东
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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